Why Copyleft? “When it comes to defending the freedom of others, to lie down and do nothing is an act of weakness, not humility.” In the GNU Project we usually. Copyleft, distinguished from copyright, is the practice of offering people the right to freely distribute copies and modified versions of a work with the stipulation. Inventó el concepto de copyleft y la licencia GPL. Ha desarrollado muchos programas informáticos, como Emacs, Gcc y GNU Debugger.


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In the case of Libre Documentation, an author can place his que es copyleft her copyright into the document, and use distribution terms, such as those in the GNU Free Documentation License, which gives everyone the rights to use, modify, and redistribute the code, que es copyleft only if those distribution terms remain unchanged.

Types and relation to other licenses[ edit ] See also: Many free software licenses are not copyleft licenses because they do not require the licensee to distribute derivative works under the same license.

Logos copyleft | Copyleft Attitude

There is an ongoing debate as to which class of license provides the greater degree que es copyleft freedom. This debate hinges on complex issues such as the definition que es copyleft freedom and whose freedoms are more important, or whether to maximize the freedom of all potential future recipients of a work freedom from the creation of proprietary software.


Non-copyleft free software licenses maximize the freedom of the initial recipient freedom to create proprietary software. In common with the Creative Commons share-alike licensing system, GNU's Free Documentation License allows authors to apply limitations to certain sections of their work, exempting some parts of their creation from the full copyleft mechanism.

In the case of the GFDL, these limitations include the use of invariant sections, which may not be que es copyleft by future editors. The initial intention of the GFDL was as a device for supporting the documentation of copylefted software.

Why Copyleft? - GNU Project - Free Software Foundation

However, the result is that que es copyleft can be used for any kind of document. Strong and weak copyleft[ edit ] The strength of the copyleft governing a work is an expression of the extent that the copyleft provisions can be efficiently imposed on all kinds of derived works.

Only changes to the weak-copylefted software itself become subject to the copyleft provisions of such a license, not changes to the software that links to it.

This allows programs of any license to be compiled and linked against copylefted libraries such as glibc the GNU project 's implementation of the C standard libraryand then redistributed without any re-licensing required.

A stronger copyleft license is the AGPL which requires the publishing of the source code also que es copyleft the usage case software as a service"see que es copyleft the term sometimes used, "service as a software substitute [SaaSS]" [30] [31] [32] e.

Examples of non-copyleft "permissive" free software licenses include the X11 licenseApache license and the BSD licenses. The concrete effect of strong vs. There are less stringent forms of copyleft. As a consequence, I prefer to use different terms.

Permissive and Copyleft Are Not Antonyms | Open Source Initiative

Instead, I explain that the communities involved have norms based of reciprocal behaviour and expect those working with their code to share with others the same freedom to innovate as they have received. Leading licensing lawyer Eben Moglen key co-creator of the modern GPL explains that open source licenses embody the norms of the communities that use them.

When it comes to defending everyone's freedom, to lie down que es copyleft do nothing is an act of weakness, not humility.


Releasing your code under one of the BSD licensesor some other lax, permissive license, is not doing wrong; the program is still free software, and still a contribution to our community. A programmer may want to contribute her changes to the community, but her employer may want to turn the changes into a proprietary software product.

When we explain to the employer that it is illegal to distribute the improved version except as free software, the employer usually decides to release que es copyleft as free software rather than throw it away.

To copyleft a program, we first state that it is copyrighted; then we add distribution terms, which are a legal instrument that gives everyone the rights to use, modify, and redistribute the program's code, or any program derived from it, but only if the distribution terms are unchanged.

Thus, the code and the freedoms become legally inseparable.